Improving QoS using Adaptive TXOP Allocation in IEEE 802. 11e WLAN

IJCA Proceedings on International Conference on Innovations in Computing Techniques (ICICT 2015)
© 2015 by IJCA Journal
ICICT 2015 - Number 1
Year of Publication: 2015
V. Ilayaraja
Vasanthakumar. K

V Ilayaraja and Vasanthakumar.k. Article: Improving QoS using Adaptive TXOP Allocation in IEEE 802.11e WLAN. IJCA Proceedings on International Conference on Innovations in Computing Techniques (ICICT 2015) ICICT 2015(1):15-21, July 2015. Full text available. BibTeX

	author = {V. Ilayaraja and Vasanthakumar.k},
	title = {Article: Improving QoS using Adaptive TXOP Allocation in IEEE 802.11e WLAN},
	journal = {IJCA Proceedings on International Conference on Innovations in Computing Techniques (ICICT 2015)},
	year = {2015},
	volume = {ICICT 2015},
	number = {1},
	pages = {15-21},
	month = {July},
	note = {Full text available}


In today's environmental world, no organization has time to wait for hours to receive data through various network channels. Everyone is looking forward to develop the Quality of Services (QoS) parameters during data transfer. IEEE 802. 11e standard for Quality of Service (QoS) in Wireless Local Area Networks (WLANs) can activate with the Differentiated Services (DiffServ). IEEE 802. 11e has established a new access mechanism called the Hybrid Coordination Function (HCF) that combines a contention-based Enhanced Distributed Channel Access (EDCA) and a contention free HCF Controlled Channel Access (HCCA) in a single function. In this mechanism, HCF scheduler is introduced to allocate transmission opportunities (TXOPs), to the stations. TXOP is the time under which the station can send its burst data packets to other stations that is applicable to existing scheduling algorithms. It works in accordance with channel and traffic conditions and complies with the link adaptation mechanism. Also in the existing system, TXOP has applied only to the four categories of MAC Service Data Unit (MSDU). But in proposed methodology, TXOP is applying to eight categories of MSDU with the support of DiffServ.


  • Abhinav Arora, Sung-Guk Yoon, Young June Choi and Saewoong Bhak, "Adaptive TXOP Allocayion Based on Channel Conditions and Traffic Requirements in IEEE 802. 11e Networks" IEEE Transaction on vehicular technology , vol 59, no. 3, pp. 1087-1099, March 2010.
  • Prof. Rathnakar Acharya, Dr. V. Vityanathan, Dr. Pethur Raj Chellaih, "WLAN QoS Issues and IEEE 802. 11e QOS Enhancement" International journal of Computer Theory and Engineering, vol 2, no. 1 Feburary, 2010
  • Shaik Madhar Saheb, A. K. Bhattecharjee, Dharmasa, "Multipath Routing Protocol Using Cross-layer based QoS Metrices for IEEE 802. 11e WLAN" International journal of Computer Application, vol. 50-No. 10,july 2012.
  • Young – Woo Nam, Sunmyeng Kim, and Si-Gwan Kim, "Fairness Enhancement Scheme for Multimedia Application in IEEE 802. 11e Wireless LANs ", International journal of Advanced Computer science and application, Vol. 3, No. 2, 2012.
  • S. Mangold, S. Choi, G. Hiertz, O. Klein, and B. Walke, "Analysis of IEEE 802. 11e for QoS support in wireless LANs," IEEE Wireless Commun. ,vol. 10, no. 6, pp. 40–50, Dec. 2003.
  • Jelena Misic, Saeed Rashwand, and Vojislav B. Misic, "Analysis of Impact of TXOP Allocation on IEEE 802. 11e EDCA under Variable Network Load" IEEE transactions on parallel and distributed systems, vol. 23, no. 5, pp 785–799, May 2012.
  • Huabing Liu, Yun Zhao, "Adaptive EDCA algorithm using traffic prediction in wireless local area networks" US 7519038 B2 Patent by Hitachi, Ltd.
  • Geyong Min, Member, Jia Hu, and Mike E. Woodward, "Performance Modelling and Analysis of the TXOP Scheme in Wireless Multimedia Networks with Heterogeneous Stations" IEEE transactions on wireless communications, vol. 10, no. 12, pp 4130-4139, Dec 2011.
  • Yang Xiao, Yan Zhang, Mike Nolen, Julia Hongmei Deng, and Jingyuan Zhang, "A Cross-Layer Approach for Prioritized Frame Transmissions of MPEG-4 Over the IEEE 802. 11 and IEEE 802. 11e Wireless Local Area Networks" IEEE systems journal vol. 5, no. 4, pp 474-485, Dec 2011
  • ns documentation. [Online]. Available: http://www. isi. edu/nsnam/ns/
  • Bahi Hour and Shihab Hameed, "Proposed Enhancement of IEEE802. 11e WLANThrough Real Time Simulation Study", The International Arab Journal of Information Technology, Vol. 6, No. 4, Oct 2009.